| # | A shock load is | an eathquake | an electrical charge | a heavy blow | an unexpected strong influent flow | a waste which is toxic to plant organisms | 4
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| 1 | The rock in most trickling filters is placed | directly in the ground. | directly in a concrete slab. | on a system of tile underdrains. | on a rubber tile floor. | none of the above. | 3 |
| 2 | The rotational speed of the air driven rotating biological contactors (RBC) is controlled by | air pressure. | air velocity. | air volume. | diffuser head settling. | none of the above. | 3 |
| 3 | What might cause a white filamentous growth in an RBS system which will result in poor BOD removal efficiency? | high ph in the wastewater. | low BOD loading. | low ph in the wastewater. | septic wastewater. | none of the above. | 4 |
| 4 | Air flow through a trickling filter when the influent is warmer than the air temperature is | upward through the filter. | downward through the filter. | inadequate and may require forced air ventilation. | improved by decreasing the recirculation. | none of the above. | 1
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